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Practice problem

Quadratic Graph Example: y=ax²

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There are four parabolas with a common vertex at the origin; the black and green ones are upward-pointing, with the black one being the wider of the two; the red and blue ones are downward-pointing, with the blue one being the wider of the two — Graph courtesy of Desmos

There are $4$ functions plotted above, with graphs $y=x^2$ , $y=-x^2$ , $y=3x^2$ , and $y=-3x^2$ . Which one is in black?